Turquoise is the one of the official birth stones for the month of December. Planetary stone for Aquarius, Taurus and Sagittarius.
The name turquoise is apparently related to the fact that it was brought to Europe from the Eastern Mediterranean by Levantine traders, more commonly known as Turks. It’s been used as a valuable ornament for ages and was used by the Egyptians thousands of years ago.

The color is, of course, turquoise, but its range of color varies from green and greenish blue to sky blue shades.
The Aztecs mined turquoise in an area now known as New Mexico and a significant amount of turquoise comes from Arizona, California and Nevada in the United States.